/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraComponent.h
Advances this system's simulation by the specified time in seconds and delta time. Advancement is done in whole ticks of TickDeltaSeconds so actual simulated time will be the nearest lower multiple of TickDeltaSeconds.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=Niagara) void AdvanceSimulationByTime ( float SimulateTime, float TickDeltaSeconds )